Completed design for v2.

models/common/beam_hexagonal.scad

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+// include <../../config.scad>;
+
+module beam_hexagonal(L, d, centre = true, suppress_shopping_outputs = false) {
+    radius = d / 2;
+    linear_extrude(L, center = centre) polygon([[radius, 0], [radius * cos(60), radius * sin(60)], [radius * cos(120), radius * sin(120)], [radius * cos(180), radius * sin(180)], [radius * cos(240), radius * sin(240)], [radius * cos(300), radius * sin(300)]]);
+    // Shopping
+    if (!suppress_shopping_outputs) {
+        echo(str("Hexagonal beam: Hexagonal beam Φ", d, "mm x ", L, "mm - x1"));
+    }
+}
+
+// $fn = 200;
+beam_hexagonal(500, 50);

models/common/br_t_nut.scad

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+// include <../../config.scad>;
+
+module br_t_nut(centre = true) {
+    difference() {
+        union() {
+            translate([0, 0, 3.2 / 2]) cube([5.7, 11.5, 3.2], center = true);
+            translate([0, 0, -1 / 2]) cube([5.7, 5.7, 1], center = true);
+        }
+        cylinder(20, 4 / 2, 4 / 2, center = true);
+    }
+    // Shopping
+    echo(str("BR T Nut: BR T Nut M4 - x1"));
+}
+
+// $fn = 50;
+// Outputs
+br_t_nut();

models/common/c_channel_beam.scad

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+
+
+module c_channel_beam(length, width, depth, thickness, suppress_shopping_outputs = false) {
+    translate([-width / 2, 0, -length / 2]) difference() {
+        cube([width, depth, length], center = false);
+        translate([thickness, thickness, 0]) cube([width - thickness * 2, depth - thickness, length], center = false);
+        translate([0, depth, 0]) cube([width, thickness, length], center = false);
+    }
+    // Shopping
+    if (!suppress_shopping_outputs) {
+        echo(str("Rectangular Aluminium channel beam: Rectangular Aluminium channel beam ", length, "mm x ", width, "mm x ", depth, "mm x ", thickness, "mm - x1"));
+    }
+}
+
+c_channel_beam(500, 19, 19, 1.6);

models/common/metric_bolt.scad

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+// include <../../config.scad>;
+use <./beam_hexagonal.scad>;
+use <./metric_bolt_functions.scad>;
+use <./metric_nut.scad>;
+
+module metric_bolt(size, length, has_nut = true, offset_nut_from_end = 0) {
+    echo("Metric bolt assembly:");
+    head_height = get_metric_bolt_head_height(size);
+    head_diameter = get_metric_bolt_head_diameter(size);
+    head_radius = head_diameter / 2;
+    color("gray") union() {
+        // Stem
+        cylinder(length, size / 2, head_height / 2, center = true);
+        // Head
+        translate([0, 0, length / 2 + head_height / 2]) beam_hexagonal(head_height, head_diameter, centre = true, suppress_shopping_outputs = true);
+        if (has_nut) {
+            // Nut
+            translate([0, 0, -(length / 2 - head_height / 2) + offset_nut_from_end]) metric_nut(size);
+        }
+    }
+    // Shopping
+    echo(str("Bolt: Bolt M", size, " x ", length, "mm - x1"));
+}
+
+// $fn = 200;
+metric_bolt(12, 100);
+translate([30, 0, 0]) metric_bolt(12, 100, false);
+translate([60, 0, 0]) metric_bolt(12, 100, true, 5);

models/common/metric_bolt_functions.scad

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+
+function get_metric_bolt_head_height(size) = size;
+function get_metric_bolt_head_diameter(size) = size * 2;
+function get_metric_bolt_washer_diameter_safe_working_clearance(size) = 
+    (size < 20) ?
+        4 * size
+    :
+        3 * size
+;

models/common/metric_countersunk_head_bolt.scad

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+// include <../../config.scad>;
+use <./beam_hexagonal.scad>;
+use <./metric_countersunk_head_bolt_functions.scad>;
+use <./metric_bolt_functions.scad>;
+use <./metric_nut.scad>;
+
+module metric_countersunk_head_bolt(size, length, has_nut = true, offset_nut_from_end = 0) {
+    echo("Metric countersunk head bolt assembly:");
+    head_height = get_metric_countersunk_head_bolt_head_height(size);
+    head_diameter = get_metric_countersunk_head_bolt_head_diameter(size);
+    nut_height = get_metric_bolt_head_height(size);
+    color("gray") union() {
+        // Stem
+        cylinder(length, size / 2, size / 2, center = true);
+        // Head
+        translate([0, 0, length / 2 + head_height / 2]) difference() {
+            cylinder(head_height, size / 2, head_diameter / 2, center = true);
+            translate([0, 0, head_height / 2 - head_diameter / 10 / 2]) cube([head_diameter / 5, head_diameter, head_diameter / 10], center = true);
+        }
+        if (has_nut) {
+            // Nut
+            translate([0, 0, -(length / 2 - nut_height / 2) + offset_nut_from_end]) metric_nut(size);
+        }
+    }
+    // Shopping
+    echo(str("Bolt: Countersunk head bolt M", size, " x ", length, "mm - x1"));
+}
+
+// $fn = 200;
+metric_countersunk_head_bolt(4, 40);
+translate([30, 0, 0]) metric_countersunk_head_bolt(12, 200, false);
+translate([60, 0, 0]) metric_countersunk_head_bolt(12, 200, true, 10);
+translate([90, 0, 0]) metric_countersunk_head_bolt(12, 100, true, 5);

models/common/metric_countersunk_head_bolt_functions.scad

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+
+function get_metric_countersunk_head_bolt_head_height(size) = size / 2;
+function get_metric_countersunk_head_bolt_head_diameter(size) = size * 2;
+function get_metric_countersunk_head_bolt_washer_diameter_safe_working_clearance(size) = 
+    (size < 20) ?
+        4 * size
+    :
+        3 * size
+;

models/common/metric_nut.scad

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+// include <../../config.scad>;
+use <./beam_hexagonal.scad>;
+use <./metric_bolt_functions.scad>;
+
+module metric_nut(size, centre = true) {
+    height = get_metric_bolt_head_height(size);
+    diameter = get_metric_bolt_head_diameter(size);
+    radius = diameter / 2;
+    color("gray") difference() {
+        // body
+        beam_hexagonal(height, diameter, centre = centre, suppress_shopping_outputs = true);
+        // hole
+        cylinder(height, size / 2, size / 2, center = centre);
+    }
+    // Shopping
+    echo(str("Nut: Nut M", size, " - x1"));
+}
+
+// $fn = 200;
+metric_nut(12);

models/common/washer.scad

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+include <../../config.scad>;
+
+module washer(t, d_outer, d_inner, centre = true) {
+    r_outer = d_outer / 2;
+    r_inner = d_inner / 2;
+    color("silver") difference() {
+        cylinder(t, r_outer, r_outer, center = centre);
+        cylinder(t, r_inner, r_inner, center = centre);
+    }
+    // Shopping
+    echo(str("Washer: Washer Φ", d_outer, "mm x ", d_inner, "mm x ", t, "mm - x1"));
+}
+
+// $fn = 200;
+washer(3, 10, 40);